I found something in aliexpress which is being marketed as "Men Sides Split Shorts".
https://www.aliexpress.com/item/32889528715.html
They look like they made the same design mistakes on them as I did with my first versions of the like some 21 years ago.
But hey, you may like 'em.
There's also the "half" style, just an apron held up by belt in front. Not seen much anymore, but there was a Lakota tiospaye (extended family) named after it.